Insulator



Jan. 7, 1941.

O. A. BOCH INSULATOR Filed May 29, 1940 :1 05mm 64 8001 f f GHOZHAMA Patented Jan. 7, 1941 UNITED STATES INSULATOR Oscar A. Boch, East Liverpool, Oln'o Application May 29,

Claims.

This invention relates to an improved construction of porcelain insulator, and more particularly to an improved construction of means for attaching a wood screw fastening to the in- 5 sulator by'means of which insulators are commonly attached to telegraph poles and the like.

More particularly, it is an aim of the invention to provide improved means for retaining a Wood screw fastening connected to the body of a porcelain insulator by means of an insert of porcelain shaped and sized to close a recess in the insulator body through which the upper end of the wood screw is inserted.

Still another object of the invention is to provide means whereby the insulator is held out of engagement with the screw head so that a twisting pressure on the screw will not cause a pressure on the insert, which might tend to dislodge it or to rupture the cement means by which the insert is fastened to the insulator body.

Other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, which illustrates a preferred embodiment of the invention, and wherein:

Figure 1 is a side elevational view, of one embodiment of the invention,

Figure 2 is a vertical sectional view taken substantially along the plane of the line 2- -2 of Figure 1 and showing the screw fastening in elevation,

Figures 3 and 4 are transverse sectional views taken substantially along the planes of the lines 3-3 and 4-4 respectively, of Figure 1,

Figure 5 is a perspective view showing the insert detached from the insulator,

Figure 6 is a view similar to Figure 2 showing a slightly modified form of the invention, and

Figure 7 is a bottom plan view taken substantially along the plane of the line 1--1 of Figure 6 showing the fastening in cross section.

Referring more particularly to the drawing, wherein like reference characters designate like or corresponding parts throughout the different views, I0 designated generally the body portion of a conventional porcelain insulator which is provided with a circular base portion ll having a substantially flat lower, free end l2.

The invention includes a recess, designated generally l3, formed in the base II and having a relatively wide upper portion I4 which extends from adjacent the center thereof radially through a portion of its side wall and which is provided with flat substantially parallel sides l5. The recess I3 also includes a restricted 1940, Serial N0. 337,919 (Cl. 174-165) be disposed with the opposite sides of the head 1 I! in engagement with the sides I5 and with a third side thereof in engagement with the inner end I9 of the recess portion I4. With the head I'I thus positioned in the portion I4, the adjacent portion of the screw shank will be disposed at the inner end of the restricted portion IS with the threaded end 28 of the screw l8 extending downwardly fromv the lower end I2 of insulator body ID.

A porcelain insert 2| is shaped and sized to snugly fit and close the recess I3 behind the screw I8 for retaining the upper portion of the screw therein. Insert 2| includes an enlarged head portion 22 for fitting the portion I4 and a lower, restricted shank portion 23 which fits the. restricted portion I6. The shank portion 23, at its inner end, is provided with an extension 24, which is offset downwardly from the head 22 and which is adapted to abut against the shank of the screw I8 to thereby retain the head portion 22 and the shank portion 23 out of engagement with the screw head H, as best seen in Figures 2, 3 and 6. The base of the head 22 is provided with a T-shaped recess 25 to receive a cement or adhesive substance 26 for securing the insert 2| in the recess I3. The upper space of the extension 24 is provided with a recess 21 to receive any overflow of the cement 26 and prevent it from forming a wall between the screw head and the insert. By thus spacing the screw head H from the insert 2|, any twisting pressure on the screw I8 will be borne by the sides I5 so that there will be no tendency to dislodge the insert 2I and rupture the seal formed by the adhesive or cement 26. As best seen in Figure 2, the outer edge of the insert H is disposed flush with the periphery of the base II and is rounded to conform to the contour thereof.

In Figures 6 and 7 a slightly modified form of the invention is shown wherein the insulator body is provided with a base I I having a restricted lower portion 28. The base II is provided with a recess I3 corresponding to the recess I3 for receiving the upper portion of the shank and the square head ll of a wood screw. The screw 18 is retained in position in the inner end of the recess [3 by means of an insert 2| corresponding to the insert 2| except that the lower portion of its outer edge, designated 29, is recessed to conform to the contour of the recess 28. A ring or collar 30 is disposed around the portion 28 and over the portion 29 for cooperating with the cement substance 26 to retain the insert 2| in position. The collar or ring 30 may be frictionally or otherwise secured to the base I l and when the insulator is secured by its screw fastening l8 to a cross arm of a telegraph pole or the .like, not shown, the lower end of the insulator body, designated l2, will be in abutting engagement with the element on which it is mounted to affectively prevent removal of the ring or collar 39. In the embodiment of the invention, as shown in Figures 6 and 7, the use of the adhesive substance 26 for securing the insert in the insulator body can be dispensed with, if desired. Since the fastening l8 must be insulated from a conductor wire, not shown, which is carried by the insulator, by forming the insert 2| of porcelain the portion of the fastening l8 which is disposed in the recess I3 is entirely surrounded by porcelain to most effectively insulate the fastening 18 from .the conductor wire.

While the fastening I8 has been illustrated and described as a wood screw, other types of fastenings, such as a bolt could obviously be used without affecting the construction and operation of the invention.

Various modifications and changes in each of the embodiments of the invention as disclosed, are contemplated and may obviously be resorted to provided they fall within the spirit and scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

1. In a porcelain insulator, an insulator hav ing a recess opening outwardly of one end thereof and of a portion of its side, said recess having an enlarged end portion, remote to said end of the insulator, and opening outwardly of the side of the insulator and extending inwardly beyond the inner end of the remaining portion of said recess, said recess being sized to receive a portion of the shank of a screw, having a rectangular head, and the enlarged portion thereof being sized to receive the screw head and to snugly engage opposite sides thereof, and an insert for closing the exposed portion of said recess, having an enlarged portion for engaging the enlarged portion of the recess, and an extended shank for abutting against the shank of the bolt for spacing the insert from the bolt head.

2. An insulator as in claim 1, the face of the enlarged portion of said insert being recessed to receive a substance for cementing the insert in the recess.

3. An insulator as in claim 1, the outer edge of said insert being disposed flush with the outer wall of the insulator, said outer wall and the outer edge of the insert being provided with a restricted lower portion for receiving a collar for retaining the insert in the recess.

4. In a porcelain insulator, an insulator having a recess opening outwardly of one end and extending radially from adjacent the center thereof through its side wall, said recess having an enlarged end, remote to said end of the insulator, for receiving the squared head of a screw and for engaging opposite sides of said head for keying it to said insulator, said recess having a restricted portion adjacent said end of the insulator, a portion of the shank of said screw being disposed in the restricted portion of the recess and projecting therefrom, an insert disposed in the outer portion of said recess and having an enlarged end for engaging the enlarged portion of the recess for retaining the screw therein, said insert having an extended portion at its inner and for engaging a portion of the shank of the screw for spacing the insert from the screw head, and means for securing the insert in the recess.

5. In an insulator, an insulator body having a radially extending recess projecting from adjacent the axis thereof through a portion of its side wall, said recess having a restricted end portion opening outwardly of an end of the insulator body and of the side wall, said recess having an enlarged portion provided with spaced substantially parallel sides constructed and arranged to receive the polygonal shaped head of a wood screw, for engaging opposite sides thereof for keying the screw head thereto, a portion of the shank of the screw being disposed in the inner part of the restricted portion of said re cess and projecting from said end of the insulater, and an insert for closing the outer, open end of the recess, said insert having an extension engaging the shank of the screw for spacing the insert from the screw head.

OSCAR A. BOCH. 

